> ## Documentation Index
> Fetch the complete documentation index at: https://docs.costgraph.ai/llms.txt
> Use this file to discover all available pages before exploring further.

# Cost forecast

> Forecast gross spend for the current calendar month, with an 80% interval. Spend already booked and fixed charges for the month count as fact; the rest of the month is projected from daily usage, and usage a provider reports as a running month-to-date total is extended to month end at the rate reported so far. Takes the same filters as the cost query. Amounts are in the scope's main billing currency; spend in other currencies is listed in excludedCurrencies and left out. point, lo, hi and modelled are null, with a reason, when there is less than a week of history.



## OpenAPI

````yaml /api-reference/costgraph/openapi.json get /api/v1/tenant/cost/forecast
openapi: 3.0.0
info:
  description: Read and manage your CostGraph organization, spend, alerts, and settings.
  title: CostGraph API
  contact: {}
  version: '1.0'
servers:
  - url: https://api.costgraph.ai
security: []
tags:
  - name: ai
    x-group: AI
  - name: ai-serving
    x-group: AI serving
  - name: anomalies
    x-group: Anomalies
  - name: auth
    x-group: Auth
  - name: billing
    x-group: Billing
  - name: billing-export
    x-group: Billing export
  - name: budgets
    x-group: Budgets
  - name: ci
    x-group: CI
  - name: compute-recommendations
    x-group: Compute recommendations
  - name: config
    x-group: Config
  - name: cost
    x-group: Cost
  - name: gpus
    x-group: GPUs
  - name: graphai
    x-group: Graph AI
  - name: infracost
    x-group: Infracost
  - name: integrations
    x-group: Integrations
  - name: invitations
    x-group: Invitations
  - name: kubernetes-clusters
    x-group: Kubernetes clusters
  - name: marketplace
    x-group: Marketplace
  - name: network-requests
    x-group: Network requests
  - name: notifications
    x-group: Notifications
  - name: oauth
    x-group: OAuth
  - name: oauth-clients
    x-group: OAuth clients
  - name: opencost
    x-group: OpenCost
  - name: organization
    x-group: Audit log
  - name: organizations
    x-group: Organizations
  - name: placement-alternatives
    x-group: Placement alternatives
  - name: reports
    x-group: Reports
  - name: service-map
    x-group: Service map
  - name: settings
    x-group: Settings
  - name: sso
    x-group: Single sign-on
  - name: tenants
    x-group: Tenants
  - name: user
    x-group: Users
  - name: virtual-machines
    x-group: Virtual machines
  - name: virtual-tags
    x-group: Virtual tags
  - name: workflows
    x-group: Workflows
paths:
  /api/v1/tenant/cost/forecast:
    get:
      tags:
        - cost
      summary: Cost forecast
      description: >-
        Forecast gross spend for the current calendar month, with an 80%
        interval. Spend already booked and fixed charges for the month count as
        fact; the rest of the month is projected from daily usage, and usage a
        provider reports as a running month-to-date total is extended to month
        end at the rate reported so far. Takes the same filters as the cost
        query. Amounts are in the scope's main billing currency; spend in other
        currencies is listed in excludedCurrencies and left out. point, lo, hi
        and modelled are null, with a reason, when there is less than a week of
        history.
      parameters:
        - description: Tenant ID
          name: X-CostGraph-Tenant-ID
          in: header
          required: true
          schema:
            type: string
        - description: Cost layer; defaults to billed
          name: layer
          in: query
          schema:
            type: string
            enum:
              - billed
              - allocation
              - ci
        - description: >-
            Repeated key:value dimension filter, with the same keys and has:/no:
            modifiers as the cost query
          name: filter
          in: query
          style: form
          explode: false
          schema:
            type: array
            items:
              type: string
      responses:
        '200':
          description: OK
          content:
            application/json:
              schema:
                allOf:
                  - $ref: '#/components/schemas/responses.SuccessResponse'
                  - type: object
                    properties:
                      data:
                        $ref: '#/components/schemas/cost.Forecast'
        '400':
          description: Bad Request
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/responses.ErrorResponse'
        '500':
          description: Internal Server Error
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/responses.ErrorResponse'
      security:
        - BearerAuth: []
components:
  schemas:
    responses.SuccessResponse:
      type: object
      required:
        - message
        - status
      properties:
        data: {}
        message:
          type: string
          example: some message
        status:
          type: string
          example: success
    cost.Forecast:
      type: object
      properties:
        actual:
          type: number
          x-semantic: costAmount
        asOf:
          type: string
        currency:
          type: string
        excludedCurrencies:
          type: array
          items:
            type: string
        hi:
          type: number
          x-semantic: costAmount
        historyDays:
          type: integer
        knownFuture:
          type: number
          x-semantic: costAmount
        lo:
          type: number
          x-semantic: costAmount
        method:
          type: string
          enum:
            - regression
            - pace
        modelled:
          type: number
          x-semantic: costAmount
        periodEnd:
          type: string
        periodStart:
          type: string
        point:
          type: number
          x-semantic: costAmount
        reason:
          type: string
    responses.ErrorResponse:
      type: object
      required:
        - message
        - status
      properties:
        message:
          type: string
          example: some message
        status:
          type: string
          example: error
  securitySchemes:
    BearerAuth:
      description: Enter "Bearer {token}"
      type: apiKey
      name: Authorization
      in: header

````

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